A Tolkienist is someone who studies the work of J.R.R. Tolkien: this usually refers to students of the Elvish languages. A Tolkienist can also be described as a hard-core fan of Tolkien's work, one who studies the work with the same amount of interest (or more) that others study non-fictional subjects. Many fans prefer this term, as it is not limited to The Lord of the Rings. As with the term Ringer, there is no group consensus on this designation.
There are also other, less widely used terms describing Tolkien fans, such as Tolkienites, Tolkienophiles or Tolkiendils (an Anglo-Quenya compound). A very early term which was never widely adopted was LotRians.